Search for neutrino bursts from stellar collapses into neutron stars or black holes with the LVD experiment at Gran Sasso

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Scientific paper

The Large Volume Detector (LVD), in the INFN Gran Sasso National Laboratory (Italy), is a 1 kt liquid scintillator detector whose major purpose is monitoring the Galaxy to study neutrino bursts from gravitational stellar collapses. The experiment has been taking data, under different configurations, since 1992, reaching in 2001 its present and final configuration.
The LVD performances from the point of view of the on-line identification of a neutrino burst are presented in this study together with the results of the updated search for neutrinos from core collapse supernovae.
The possibility to observe weak neutrino signals expected from neutron stars collapsing into black holes on the basis of a model prediction which deals with bursts durations of few milliseconds is discussed. The behavior of the detector background over a wide range of time windows, from I ms to 200 s, has been analyzed, and the detector sensitivitv to these kind of events is discussed.

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